60 Years legendary semiconductor — Baoshi 4B2


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The Baoshi brand4B2 type 3 machine, the 1964 Shanghai radio factory produced. This machine is the “radio” 60 years “back cover” one of the stars and legendary. Concentrated almost all of the bright spots pursued by the current collectors of the old machine: 4B2 curved chassis with Gantry, direct dial generous circling New York; large paper-electrolytic, fixed capacitor, resistor Lvpao five inch 1 watt 3.5 ohm speaker. The big air and even a single large switch potentiometer, a water tube machines and equipment. Add that the transistor is 2Z301 and 2Z182, typical Shanghai style, like grade higher П4, П6 Series a. Process, scaffolding welding and rivet welding, adhering to the fine tradition of the tube machine.

Made transistor radios started in the early 1960s, while walking two routes, one is the introduction of counterfeit, Peony 8402 as its representative; self-reliance, Peony 2401, the deer 163-A, the Begonia TR2 is-1, as well as Baoshi 4B2 are one of the masterpiece. I like self-reliance of domestic products, and find them more flavor.

The early 1960s there is a clear feature of the domestic semiconductor is to make full use of the tube machine components and processes, to reduce costs and technical barriers. Desktop semiconductor production at the time such part of the tube and power, the other components and tube machine is almost the same. Technology and tube machine like base plate on both sides to placement of parts. Because large components appear only in the base plate, called the board on both sides of cloth to put the most space-saving. For desktop semiconductor speaking, to do this is not difficult, the limited thickness of the laptop is more difficult.Baoshi 4B2 domestic semiconductor portable machine, the forerunner of the old-fashioned vacuum tube machine components and processes, and do the best. In order to reduce the thickness of the radio, 4B2 panel of circuit boards and chassis parallel (desktop is mostly vertical). Interestingly, since the Pearl River SB6-type 2 laptops, 6 Although the evolution to a printed circuit boardstage, double, in the week have been small, but still not “double-loaded” primary mode freed.

Circuit design baoshi 4B2, very close to the national conditions of China, for the sake of the vast rural areas and non-AC areas, and strive to improve efficiency, lower utility costs. From the schematic, 4B2 1960s luxury to re-regeneration circuit: a magnetic antenna coil segment winding can be improved directional; frequency coverage using the pull of the negative temperature coefficient tuning capacitor, so that the radio when the ambient temperature changes stable; dual-loop high-frequency choke, can improve the uneven sensitivity of the situation of the whole band;

High-frequency amplifier stage and power amplifier stages are used the higher stability of the current feedback bias circuitry, reducing the transistor affected by temperature caused by the drift of the operating point; П-type filter circuit, even if the battery voltage is reduced to less than half of 2.5V still can be stabilized to listen to local radio broadcasts. The last point is particularly important because the living standards of the 1960s is generally not high, replace the four batteries of the cost burden is not light.

Baoshi 4B2 Dimensions 230X150X80 mm, the whole machine weighs 1.6 kg, the initial test products sold by the casing back cover brand model identification. 4B2 face horn plastic window grille is very fragile, easily broken, which is this machine product rare. My hand this Baoshi 4B2, have to struggle to find.

2,3 years ago, Yunnan, a seller in the online sale a 4B2, the aircraft inside and outside the product as a very new, unfortunately, is the speaker windows trash rack all the broken lose. I hesitated for a few days, and that Taiwan 4B2 the owner on the radio forum for sale, be bought by the Beijing altar Friends of the bjsd Mr. Xu. At that time, I did not think about anything. But soon her husband travel to Taiyuan, Shanxi, bought back from the altar Friends of e-selling “a 4B2 residues machine, I was very upset them, because this 4B2 horn window is intact! Mr. Xu later in the jar to buy a speaker window similar semiconductor transformation repair 4B2, the effect is very good.

Mr. Xu to the 4B2 restored on the radio forum “show off”, see my mouth water. Then I thought, we and Mr. Xu is a friend of many years, why not the cheek to ask him to transfer? Mr. Xu is very happy so I agreed, so I am very moved. You know, won the Mr. Xu love, this is the first N times. “E to sell things that 4B2 speaker window change to Mr. Xu 4B2, really perfect! Carefully check something, I thought that this machine is the first test marketing products 4B2, back cover brands and models; machine in addition to the speakers out the window, no repair no friction, all original condition, and be able to listen to normal.

Radio 1964 6 Description the Baoshi 4B2 article saying, “It’s a loud sound, and 30 square meters of indoor everywhere can clearly listen.” This sentence is that memorable era to describe a transistor radio commonly used word, at that time should be words of praise; today it seems, the words, but makes a somewhat sour, but it is the things we have experienced. See the front of this authentic Baoshi 4B2, as if we walked into the Museum of History.

1964 6 “radio” back cover

The Zhujiang SB6-2 type six portable machine, though already evolved to the printed circuit board stage, double, in the week have been small, but still not “double-loaded” primary mode freed.

 


Sample/Wholesale
Price
Shipping
Carrier
Buy it Now
1 pcs sample
USD
/pcs
USD
Airmail 25days

pcs
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